Two-button switch.



F. W. SANFORD. TWO BUTTON SWITCH. APPLICATION IILED- OUT. 2, 1905.

Patented Oct. 13,1908.

Witnsses;

FRANK W. SANFORD or SCHENECTADY, NEW YORK, As slouch T GENERAL ELECTRICCOMPANY, ACOBPORATION ornnw roan.

mus ums swmcn.

Specification or Letteifiatht. V BaltientedOct. 13; mos...

Application fiIcd Octobe'r- 2, 1905. 7 Serial 1 9,220,881.

To a'ZZ whom it may concern: I?

Be 1t known that I, FRANK W. SANFORD,

a citizen of the United States, residing at Schenectady, counti ofSchenectady, State v of New York, haxfe invented certain new anism sothat nearly all the parts can be punched from sheet metal by disks andassembled without further finishing.

The switch comprises an arbor on which are loosely pivoted one or twoinsulated cone tact-blades, a coiled spring concentric with saidarbor,an'escapeplate pivoted on said" arbor and rigidly connected with thecontactblades, an arm on said plate passing between the ends ofsaid'spri-ng, a spring-stretcher pivoted on said arbor and having an armpassing between the ends ofsaid spring, a

tilting locking-plate having a lug, a pallet 00-- operating with'anescapement lug on the eseapeplate, and api'n engaging' with a forkon thespring-stretcher, vtwo push-buttons pivotally connected with thelodking-plate,

I near its to1 ),'and.througli this boss passesjan' arlqor 8 aft right.angles-j to saidIframe "and. transverse to' the casing 1-; 50h each "endof, the'arbor is' loosely mounted a doi-ibl-e}enderl.

and the usual inclosing .and supporting case mg, contact-clips, andother parts:

In the accoinpanyln-g drawing, Flgure 1 IS a plan view of a switchembodying my inven-' tion, the face-plate having been removed; Fig. 1s across-sect1on ot the same through the arbor; Fig. 3 1s a sectlonalelevation of the working parts, on the line 3 3, Fig. 2; Flg. 4 1s asimllar section, on-the line 4 4, Fig.- 2; Big. 5 1s a similar sectionon the line 5 5 Fig. 2; Fig. 6 perspective view of one eontactblade,.Fig. 7 shows :the escapeplate; Fig. 8 the spring-stretcher; and Fig. 9the other contact-blade. l

The box or easing l ismade of porcelain or other insulating material andhas a hole 2 in each cornerfor the admission of the line wires. Ad acentto each hole is a contactelip 3 provided with a binding-screw 4.. In

the bottom ofthe casing is 'a'sha'llow recess to 1 receive the foot 5 ofthe frame 6, which is preferablv madeof sheet metal. A cylindrical.

boss .7 projects from one side'ef the fframe.

stand as shown in Figs. 1, 2 and v contact-blade 9., whieh jis,insulatedilroin the arbor and from the two clalnping disks 10 10 heldtogether by rivets 1 1 1 1. AIlllS extend between the innc diskon eachblade toan escape-platellZ having a hub l-3 journaled on the arbor; Thepreterredt'onstrum tion is that shown, in which the blade!) has two arms1-4 extending from 'its-innerdisk 10 parallel'wi-th the arbor,their'end-s engaging with. notches .inthe ed e otithe escapeplate; whilethe other blanc 9, 18 connected with-said plateby' an armidintegral withthe plate and extendingparalle-l -withthe arbor to'engage with a notch17 inthe inner 'dis'k'10 'of said blade 9;. The two blades" and theeseape+plate are thus rigidly locked togethenfso that they turn as onepiece on the arbor. V {l he I escape-plate also has an escapemen-t lug118 j projecting in, the same direction as: the arm 16, but on theopposite side'of thearbon, j I

A helical spring 19 encircles the boss 7 and its ends projectradiallyoneaeh side of the arm 16. Aspring+stretcher 20 is pivoted onthe arbor adjacent to. theescape-plate, and has L an arm 21 extendingparallel with the arbor underneath the arm 16 and between the ends ofthe spring; 19, but terminating just-short of the disk 10. i Thelower'end of the springstretcherh-as a fork 22 to engage with a pin 23ona tilting locking-plate 24, which is piv oted on a trunnion 25projecting 'froin'the' frame. .A lip 261is turnedupfrom the foot 5 ofsaid frame'toprejvent the lockin'q-plate from slipping off the trunnion.A pa let-lug 27 projects from the face of the loeking-plate andcooperates with the escape nent-lug IS on the escape-plate. Twopush-buttons 28 29 have stems 30 which are pivotally attached to theends of the locking-plate.

The operation is as follows: Let the parts The b utton 29 is in thecontact-blades are closed cape-plate and the spring-stretcher liesuper-I posed between the ends of the'spring and against theleft handstop-shoulder 31 of the frame 6. N ow if one pushes downward on thebutton 28, the locking-plate is tilted and -.its'pin 23 turns thespring-stretcher, causing its arm 21 to lnoveov'er to the right,carrying before it oneend of the spring, the other end of which restsagainst the arm 16 of the escape-plate. Just' as' the locking-plate be.{gins to tilt. its palleelug 27 is carried up opposite the end of theescapement-lug 18 on the escape-plate, so that the latter is heldlocked-in spite of the pressure of'the spring over to the stop-shoulderS2 of the frame;

the position shown in Fig. 4. The next instant the pallet-lug clears theend of theeseapement-lug 1S, and the spring, which has been put undertension by this separation of its ends, throws the arm 16 c ver againstthe stop-shoulder 32, in line with the spring stretcher arm 2] 3 theposition shown in Fig. 5. This movement of the escapeplate opens theswitch. The closing movement is the reverse of this; the pallet-luglocking the escape-plate until the spring-stretcher has almost reachedthe stop-shoulder 31 and then releasing it when the spring is under itsgreatest tension.

One merit of the present invention is the fact that the disks 10 10, theescape-plate 12, the spring-stretcher 20, the locking-plate 24, theframe 6 and the stems 30 of the buttons are all sheet-metal punehings.and 27, the pin 23, the trunnion and the hub 33 of the spring-stretcherare all accurately formed by dies, and very little labor is' required toassemble the parts.

The switch shown and described is a doublevpole switch, but it isevident that by omitting one contact-blade the same mechanism wouldoperate equally well as a singlepole switch.

\Vhat 1 claim as new and desire to secure by Letters Patent oi theUnited States, is,-

1. In a two-button sna switch, the combination with a contactdfl ade, of.an escapeplate rigidly connected therewith and having anescapement-lug, a spring for actuating said plate, a springstretcher, atilting lock- The lugs 18- the spring-stretcher and having a pallet-lugcooperating with the escapen'ientdug, and

buttons connected with said locking-plate.

2. Ih'a two-button snap switch, the combination with a contact-blade, ofan escape plate rigidly connected therewith and having an escapement-lugand an arm, a spring having its ends standing on opposite sides of saidarm, a pivoted spring-stretcher having an arm lying between the ends ofsaid spring, a tilting locking-plate connected by a pin and slot withsaid spring-stretcher and having a pallet-lug adapted to pass across theends of said escapemen't-lug, and buttons pivotally connected with saidlocking-plate.

3. In a snap switch, the combination with the tilting lever, of a frameplate having a trunnion on which said lever is fulcrum'ed, and a'lipibent up from said plate and overlying said lever to prevent itsdisengagement from said trunnion.

4. In a two-button snap switch, the combination with an arbor, of twoinsulated.

contact-blades journaled thereon, an escapcplate also journaled on saidarbor between said blades and rigidly connected therewith, aspringconcentric with said arbor, a forked spring-stretcher journaled on saidarbor, arms on the escape-plate and sprini stretcher-engaging with saidspring, a 100 is ing plate pivoted adjacent to said arbor, a pin on saidplate engaging the fork of the spring-stretcher, and cooperating lugs onsaid escape-plate and locking late.

In witness whereof, I iave hereunto set my hand this th day ofSeptember, 19.05.

BENJAMIN B. HULL, MARGARET E. WOOLLEY.

